copolymers

I'm struggling on understanding how you know which alkenes have been used to create a copolymer when you are given the copolymer's structural formula. I just don't get how you do it and the Chemical Ideas book isn't so helpful . Any advice?

Thanks

A copolymer consists of 2 monomers. There are certain types of copolymer.
The monomers would have to be distinct enough for you to tell apart.

But how do I know which ALKENES were used to create a given copolymer?

The alkenes are the monomers . . . Except that the double bond has been broken in the polymerization reaction.

See the attachment


This question is bugging me. Can you please help me with it? The answer is but-1-ene and propene. But I need to actually understand why??? I know that if the chain has repeating monomers. So if you take out one monomer, you should just see the 2 alkenes used to make the copolymer. But for some reason when I take out a single monomer and draw it, I get stuck since I get a wrong structure.

Start by drawing out the ethyl and methyl groups completely, it should clarify where the propene and butene come from.
EDIT: Don't let the bend in the chain confuse you - its still a straight chain monomer.

I did that and then the rest looked easy.

Thanks